Screw-cutting wrench.



` GL J. G oTTsoHE.

'SCREW GUTTIN@ WRENGH.

APPLICATION FILED H0115, 1910.

Patented Feb. 28, 1911.

"lll/ll fume.

JYVVENIORI Align/ey,

UNITED sTATEs I nrENr oEEIoE..

GEORGE J. GOT'ISCHE, OF SPRINGFIELD, MASSACHUSETTS.

SCREW-CUTTING Wannen.

Specicaton of Letters Patent.

Patented Feb. 28, 1911.

Application filed November 15, 1910. Serial No. 592,477.

To all whom it may concern:

Be it known that I, GEORGE J. Go'r'rscnn, a citizen of the United States of America, and resident of Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful 1mprovements in Screw-Cutting Wrenches, o f which the following is a full, clear, and exact description.

This invention relates to improvements 1n screw cutting wrenches and is similarly applicable in an implement for holding a tap or in an implement for cutting screw threads externally on a round piece of stock.

The object of the invent-ion 1s to produce a screw cutting'wrench or implement which is of extremely simple construction and composed of very few and cheaply made parts.

The invention is described in conjunction with the accompanying drawings and set forth in the claims.

In the drawings -Figure 1 is a partial plan and partial horizontal longitudinal sec* tional view through the device indicated as adapted for the purposes of a tap wrench. Fig. 9. is a similar view showing the jaw member of the implement made as screw threading dies. Fig. 3 is a cross section on a somewhat enlarged scale taken on line BJB, Fig. l. Fig. 4c is a cross sectional view on line fi-4, Fig. l. Fig. 5 is a partial vertical sectional Vview as taken longitudinally, on the line 5 5, Fig. 2.

In the drawings, A represents" the body or stock of the implement made with an aperture a through its middle and having longitudinally alined bar receiving bores b through its portions c e at opposite sides of it-s middle aperture; and one of its portions e has a recess f which opens inwardly to the longitudinal bore through such portion. A handle bar B is litted through the bore in one of the end portions of the body A, and has its end protruding within the aperture a and is rigidly aliixed in its position as shown by any suitable means, as, for instance, by a fastening pin g. Another handle bar B2 is fitted and is slidable endwise through the other bore, and it has a portion thereof provided with spiral threads 71,; and these are provided for preventing the rotation of the endwise slidable handle bar B2, which in the present instance is a splining construction composed of the longitudinal groove orkey way in the bar and the key j located within the bore t and engaged in the keyway. C represents a cylindrical element, located in the aforementioned recess and made, peripherally with worin threads m for engagement with the threads or teeth of the handle bar B2. 0 represents the pivot pin penetrating the body A from an end thereof offside from its longitudinal center and serving as the journal for the worm C. The approached ends of both of said bars B and l?)2 which have their locations within the central aperture a are constructed with coacting jaws, those In n in Figs. l and t being represented as of V- shape, that is having 90 degree recesses therein to adapt them for gripping the squared shank m of a tap die; but in Figs. 2 and 5 the approached coacting inner end portions of the handle bars have the jaws n2, n2 thereof shown as dies for cutting screw threads on a round piece, such as indicated at y.

The mere turning of the worm C adjusts the jaw portion of the movable handle bar to its required degree of sepa-ration from the jaw portion at the inner end of the rigidly connected handle bar B; and the adjusting device being in substance a worm gear is held firmly and reliably locked against any displacement force excepting sili'chd as is purposely and intelligently app 1e Although in thedrawings the teeth z, on the round handle bar B2 are represented as produced by spirally threading the bar,- such being one very convenient inode of producing the teeth, the latter manifestly may be produced otherwise.-

In addition to its entire operative efficiency, an important merit of the described implement, as an inspection of the drawings will indicate, will be appreciated as dependent on the very few components and the 4 simple structural character thereof.

I claim In an implement -of the character described, in combination, a body intermediately apertured, having longitudinally alined bar receiving bores through its portions at opposite sides of its aperture, and having a recess in its portion at one side of its aperture which inwardly opens to the longitudinal bore through such portion, a bar fitted through and secured in one of said bores, and another bar fitted and slidable through the other bore, having a portion thereof provided with teeth, and means Signed by Alne at Springeld, Mass., in presence of two subscribing Witnesses.

GEORGE J. GOTTSCHE.

Witnesses WM. S. BELLoWs, G. R. DRIsooLL.

for preventing` the rotation thereof, both said bars being formed with ooaeting jaws at their approached ends Within the ntermedate aperture, a Worm located in said recess engaging the spiral threads of the movable bar, and means for pvotally supporting the so located Worm on the body.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, I). C. 

